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Cartesia

S tiernew this month

Ultra-low-latency voice. Built for realtime agents.

Open Cartesia →Compare with alternatives

Kai's verdict

S-tier for realtime. If latency matters more than voice catalog, start here.

Strengths

  • < 90ms latency — the fastest in the market
  • Sonic model sounds natural
  • Developer-friendly API

Weaknesses

  • Fewer voices than ElevenLabs
  • Less consumer-facing brand

Best for

Developers building voice agents, phone bots, interactive apps.

Pricing

Free tier + usage-based API

Alternatives worth knowing

ElevenLabs
S
The voice gold standard. Cloning + TTS + dubbing.
OpenAI Voice / Realtime
S
ChatGPT's voice + the Realtime API for developers.
Play.ht
A
Enterprise-grade TTS with voice cloning.